Billy Godbold's book on Cams and Valvetrains is available now. I typically buy all the car books that come out and generally they are a disappointment but not this time. Billy packs a ton of tech into this book. In fact, it has so much tech I wouldn't recommend this book for anyone other than serious students. It is not an easy read that you can just skim thru and look at the pictures. He obviously has worked on a lot of really high performance engines and it shows. Some of the stuff he talks about isn't known outside of the handful of guys who build engines that win at the highest levels.